System for removing paraffin blockage of oil pipe

A technology for removing systems and oil pipes, which is applied to cleaning appliances, wellbore/well components, isolation devices, etc., can solve problems such as unsatisfactory practical application, poor wax dissolution effect, and large loss, achieving low cost, high solution cost, The effect of saving operating costs

Inactive Publication Date: 2014-07-30
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above technical solution uses electric current to heat the oil extraction pipe to dissolve the paraffin attached to the inner pipe wall of the oil absorption pipe. The practical application is not ideal. The patent is completely different from the above technical solutions

Method used

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  • System for removing paraffin blockage of oil pipe
  • System for removing paraffin blockage of oil pipe

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Embodiment Construction

[0019] Such as figure 1 As shown, the tubing wax plug removal system is mainly composed of an outer pipe 1, a well flushing pipe 2, an upper seal 3, a lower seal 4, a self-switching tee 5, a pump 6, a cleaning fluid pipeline 7 and a heater 8. The lower end of the outer pipe 1 is fixed on the wellhead christmas tree 9 and communicates with the production tubing 10 at the bottom of the wellhead christmas tree 9, and the lower end of the well cleaning pipe 2 passes through the outer pipe 1 and the wellhead christmas tree 9 in turn, and extends into the In the production tubing 10, the upper seal 3 and the lower seal 4 are distributed at intervals along the axial direction of the outer pipe 1, separating the annulus 11 between the outer pipe 1 and the well cleaning pipe 2 into a closed annulus section 12. The switching tee 5 is arranged on the well flushing pipe 2 and is located in the closed annular space section 12. The pipe wall of the outer pipe 1 is provided with a liquid inl...

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Abstract

The invention discloses a system for removing the paraffin blockage of an oil pipe. The system mainly comprises an outer pipe, a well washing pipe, an upper seal, a lower seal, a self-switching tee joint, a pump, a cleaning liquid pipeline and a heater, wherein the lower end of the outer pipe is fixedly arranged on a wellhead Christmas tree and is communicated with an oil production pipe arranged at the bottom of the wellhead Christmas tree; the lower end of the well washing pipe sequentially passes through the outer pipe and the wellhead Christmas tree, and extends into the oil production pipe; the space between the outer pipe and the well washing pipe is divided into a closed ring space section by the upper seal and the lower seal; the self-switching tee joint is arranged on the well washing pipe and in the closed ring space section; the two ends of the cleaning liquid pipeline are respectively connected with a liquid inlet and a liquid outlet which are arranged on the wall of the outer pipe; the cleaning liquid pipeline is provided with the pump and the heater. After the structural form is adopted, the system is convenient for offshore oilfield paraffin blockage removal operation, and has the characteristics of being simple and convenient to operate, low in cost and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of offshore oilfield engineering, in particular to a system for removing oil pipe wax plugging. Background technique [0002] In the process of oil exploitation, the waxing of the oil well will cause the oil pipe to shrink, affect the normal production of the oil well, and even block the production oil pipe, causing the oil well to stop production. Solidification in the tubing string plugs the production tubing. Once the production tubing is completely blocked, conventional means cannot be used to remove the wax blockage. Coiled tubing is used for circular flushing in the production tubing, which can remove wax plugging, but the operation cost of coiled tubing is high, and some production platforms have limited hoisting capacity, so it is impossible to hoist the coiled tubing to the platform for wax removal operations; wax removal drills can be used to scrape the inside of the tubing Oil and wax, but this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/00E21B36/00
Inventor 贾辉宋立志黄凯文颜明谢思宇曾玉斌宋吉锋李彦闯
Owner CHINA NAT OFFSHORE OIL CORP
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